在Python中,對於每個元素,返回字串中子字串找到的最高索引
要在字串中返回子字串sub找到的最高索引,請在Python NumPy中使用numpy.char.rfind()方法。該方法返回整數輸出陣列。如果未找到sub,則返回-1。第一個引數是輸入陣列。第二個引數是要搜尋的子字串。
步驟
首先,匯入所需的庫:
import numpy as np
建立一個一維字串陣列:
arr = np.array(['KATIE', 'JOHN', 'AmY', 'BRATleuATp'])
顯示我們的陣列:
print("Array...\n",arr)獲取資料型別:
print("\nArray datatype...\n",arr.dtype)
獲取陣列的維度:
print("\nArray Dimensions...\n",arr.ndim)獲取陣列的形狀:
print("\nOur Array Shape...\n",arr.shape)獲取陣列的元素個數:
print("\nNumber of elements in the Array...\n",arr.size)要返回字串中子字串sub找到的最高索引,請使用numpy.char.rfind()方法:
print("\nResult (rfind)...\n",np.char.rfind(arr, 'AT'))
示例
import numpy as np
# Create a One-Dimensional array of strings
arr = np.array(['KATIE', 'JOHN', 'AmY', 'BRATleuATp'])
# Displaying our array
print("Array...\n",arr)
# Get the datatype
print("\nArray datatype...\n",arr.dtype)
# Get the dimensions of the Array
print("\nArray Dimensions...\n",arr.ndim)
# Get the shape of the Array
print("\nOur Array Shape...\n",arr.shape)
# Get the number of elements of the Array
print("\nNumber of elements in the Array...\n",arr.size)
# To return the highest index in the string where substring sub is found, use the numpy.char.rfind() method in Python Numpy
print("\nResult (rfind)...\n",np.char.rfind(arr, 'AT'))輸出
Array... ['KATIE' 'JOHN' 'AmY' 'BRATleuATp'] Array datatype... <U10 Array Dimensions... 1 Our Array Shape... (4,) Number of elements in the Array... 4 Result (rfind)... [ 1 -1 -1 7]
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